JAVA - 查看String是否为null或者空

snippet.java

public static String nullToEmpty(@Nullable String string)
{
	return (string == null) ? "" : string;
}

public static @Nullable String emptyToNull(@Nullable String string)
{
	return isNullOrEmpty(string) ? null : string;
}

public static boolean isNullOrEmpty(@Nullable String string)
{
	return string == null || string.length() == 0; // string.isEmpty() in Java6
}

很好 ， 学习了